809235249 has 4 divisors (see below), whose sum is σ = 1078980336. Its totient is φ = 539490164.

The previous prime is 809235233. The next prime is 809235263. The reversal of 809235249 is 942532908.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 809235249 - 2⁴ = 809235233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 809235249.

It is not an unprimeable number, because it can be changed into a prime (809230249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134872539 + ... + 134872544.

It is an arithmetic number, because the mean of its divisors is an integer number (269745084).

Almost surely, 2^809235249 is an apocalyptic number.

It is an amenable number.

809235249 is a deficient number, since it is larger than the sum of its proper divisors (269745087).

809235249 is a wasteful number, since it uses less digits than its factorization.

809235249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269745086.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 809235249 is about 28447.0604632535. The cubic root of 809235249 is about 931.8762940829.

It can be divided in two parts, 80 and 9235249, that added together give a palindrome (9235329).

The spelling of 809235249 in words is "eight hundred nine million, two hundred thirty-five thousand, two hundred forty-nine".